package com.usian.admin.gateway.filter;

import com.usian.jwt.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.log4j.Log4j2;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

@Component
@Log4j2
public class AuthorizeFilter implements GlobalFilter, Ordered {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取请求对象和响应对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //2.判断当前的请求是否为登录，如果是，直接放行,当前是登录接口的访问，不做校验
        if (request.getURI().getPath().contains("/login/in")) {
            return chain.filter(exchange);
        }
        //3.获取当前用户的请求头jwt信息
        HttpHeaders headers = request.getHeaders();
        String token = headers.getFirst("token");
        //4.判断当前令牌是否存在
        //4.判断当前令牌是否存在
        if (StringUtils.isBlank(token)) {
            String json = "{\"errorMsg\":\"dont have token\"}";
            return response.writeWith(Flux.just(response.bufferFactory().wrap(json.getBytes())));
        }
       try {
           //5.如果令牌存在，解析jwt令牌，判断该令牌是否合法，如果不合法，则向客户端返回错误信息
           Claims claims = AppJwtUtil.getClaimsBody(token);
           int i = AppJwtUtil.verifyToken(claims);
           if (i == 0 || i == -1) {
               Integer id = (Integer)claims.get("id");
               ServerHttpRequest newRequest = request.mutate().headers(httpHeaders -> httpHeaders.add("userId", id + "")).build();
               exchange.mutate().request(newRequest).build();
           }
       }catch (Exception e){
           e.printStackTrace();
           //想客户端返回错误提示信息
           String json = "{\"errorMsg\":\"dont have token\"}";
           return response.writeWith(Flux.just(response.bufferFactory().wrap(json.getBytes())));
       }
        //6.放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
